'use client';

import { useState, useEffect } from 'react';
import { useRouter } from 'next/navigation';
import { AppLayout } from '@/components/layout/AppLayout';
import { Welcome } from '@/components/features/Welcome';
import { ChatInput } from '@/components/features/ChatInput';
import { QuickActions } from '@/components/features/QuickActions';
import { getGreeting } from '@/data/mock';
import { useAuth } from '@/providers/AuthProvider';
import { useConversations } from '@/hooks/useConversations';
import { useModels, useTools, useSettings } from '@/hooks/useSettings';
import type { QuickAction } from '@/types';

export default function HomePage() {
  const router = useRouter();
  const { user } = useAuth();
  const { createConversation } = useConversations();
  const { models, loading: modelsLoading } = useModels();
  const { tools: availableTools, loading: toolsLoading } = useTools();
  const { settings } = useSettings();

  const [selectedModelId, setSelectedModelId] = useState<string>('');
  const [enabledTools, setEnabledTools] = useState<string[]>([]);
  const [isSending, setIsSending] = useState(false);

  // 使用真实登录用户的昵称，如果未登录则显示"用户"
  const greeting = getGreeting(user?.nickname || '用户');

  // 初始化默认设置
  useEffect(() => {
    if (settings) {
      setSelectedModelId(settings.defaultModel);
      setEnabledTools(settings.defaultTools || []);
    }
  }, [settings]);

  // 转换模型格式
  const modelOptions = models.map((m) => ({
    id: m.modelId,
    name: m.modelId,
    displayName: m.displayName,
    tag: m.supportsThinking ? 'Thinking' : '',
  }));

  const selectedModel = modelOptions.find((m) => m.id === selectedModelId) || modelOptions[0];

  // 转换工具格式
  const toolOptions = availableTools.map((t) => ({
    id: t.toolId,
    name: t.displayName,
    icon: t.icon || 'Tool',
    enabled: enabledTools.includes(t.toolId),
  }));

  const handleToolToggle = (toolId: string) => {
    setEnabledTools((prev) =>
      prev.includes(toolId)
        ? prev.filter((t) => t !== toolId)
        : [...prev, toolId]
    );
  };

  const handleEnableAllTools = (enabled: boolean) => {
    if (enabled) {
      setEnabledTools(availableTools.map((t) => t.toolId));
    } else {
      setEnabledTools([]);
    }
  };

  const handleSend = async (message: string) => {
    if (isSending) return;

    setIsSending(true);
    try {
      // 创建新对话
      const newConversation = await createConversation({
        title: message.slice(0, 50),
        model: selectedModelId || 'default',
        tools: enabledTools,
        enableThinking: settings?.enableThinking || false,
      });

      // 跳转到新对话页面并携带初始消息
      router.push(`/chat/${newConversation.conversationId}?message=${encodeURIComponent(message)}`);
    } catch (error) {
      console.error('Failed to create conversation:', error);
    } finally {
      setIsSending(false);
    }
  };

  const handleQuickAction = (action: QuickAction) => {
    if (action.prompt) {
      handleSend(action.prompt);
    }
  };

  // 快捷操作
  const quickActions: QuickAction[] = [
    { id: '1', label: '写代码', prompt: '帮我写一段代码', icon: 'Code' },
    { id: '2', label: '解释概念', prompt: '解释一下什么是', icon: 'BookOpen' },
    { id: '3', label: '调试代码', prompt: '帮我调试这段代码', icon: 'Bug' },
    { id: '4', label: '代码审查', prompt: '请审查这段代码', icon: 'Search' },
  ];

  if (modelsLoading || toolsLoading) {
    return (
      <AppLayout>
        <div className="flex items-center justify-center min-h-[400px]">
          <div className="text-[var(--color-text-tertiary)]">加载中...</div>
        </div>
      </AppLayout>
    );
  }

  return (
    <AppLayout>
      <div className="w-full max-w-[900px] mx-auto">
        {/* 欢迎区域 */}
        <Welcome greeting={greeting} className="mb-8" />

        {/* 聊天输入框 */}
        <ChatInput
          models={modelOptions}
          selectedModel={selectedModel}
          onModelSelect={(model) => setSelectedModelId(model.id)}
          tools={toolOptions}
          onToolToggle={handleToolToggle}
          onEnableAllTools={handleEnableAllTools}
          onSend={handleSend}
        />

        {/* 快捷操作 */}
        <QuickActions
          actions={quickActions}
          onSelect={handleQuickAction}
        />
      </div>
    </AppLayout>
  );
}